Evidence map›Paper›PMID 27849580›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2016

Global patterns of kelp forest change over the past half-century.

Kira A Krumhansl, Daniel K Okamoto, Andrew Rassweiler, Mark Novak, John J Bolton, Kyle C Cavanaugh, Sean D Connell, Craig R Johnson, Brenda Konar, Scott D Ling and 27 more

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 152 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
152citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

152 citing papers in PubMed, 1 synthesis or guideline pooled it.

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  16. Historical data reveal extirpation of foundation species and kelp forest community deborealization in a coastal hotspot.Ecological applications : a publication of the Ecological Society of America · 2026
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92 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

37 authors.

Kira A KrumhanslSchool of Resource and Environmental Management, Hakai Institute, Simon Fraser University, Burnaby, BC, Canada V5A 1S6; kkrumhan@sfu.ca.
Daniel K OkamotoSchool of Resource and Environmental Management, Hakai Institute, Simon Fraser University, Burnaby, BC, Canada V5A 1S6.
Andrew RassweilerDepartment of Biological Science, Florida State University, Tallahassee, FL 32306.
Mark NovakDepartment of Integrative Biology, Oregon State University, Corvallis, OR 97331.
John J BoltonDepartment of Biological Sciences and Marine Research Institute, University of Cape Town, 7701 Rondebosch, South Africa.
Kyle C CavanaughDepartment of Geography, University of California, Los Angeles, CA 90095.
Sean D ConnellSouthern Seas Ecology Laboratories, The Environment Institute, The University of Adelaide, Adelaide, SA 5005, Australia.
Craig R JohnsonInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, 7001 TAS, Australia.
Brenda KonarCollege of Fisheries and Ocean Sciences, University of Alaska, Fairbanks, AK 99775.
Scott D LingInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, 7001 TAS, Australia.
Fiorenza MicheliHopkins Marine Station, Stanford University, Pacific Grove, CA 93950.
Kjell M NorderhaugNorwegian Institute for Water Research, 0349 Oslo, Norway.
Alejandro Pérez-MatusSubtidal Ecology Laboratory and Marine Conservation Center, Estación Costera de Investigaciones Marinas, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago, Chile.
Isabel Sousa-PintoInterdisciplinary Centre for Marine and Environmental Research, 4450-208 Matosinhos, Portugal.
Daniel C ReedMarine Science Institute, University of California, Santa Barbara, CA 93106.
Anne K SalomonSchool of Resource and Environmental Management, Hakai Institute, Simon Fraser University, Burnaby, BC, Canada V5A 1S6.
Nick T ShearsLeigh Marine Laboratory, Institute of Marine Science, The University of Auckland, Auckland 0941, New Zealand.
Thomas WernbergOceans Institute, University of Western Australia, Perth, WA 6009, Australia.
Robert J AndersonDepartment of Biological Sciences and Marine Research Institute, University of Cape Town, 7701 Rondebosch, South Africa.
Nevell S BarrettInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, 7001 TAS, Australia.
Alejandro H BuschmannCentro de Investigación y Desarrollo en Recursos y Ambientes Costeros, Universidad de Los Lagos, Puerto Montt 5480000, Chile.
Mark H CarrDepartment of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064.
Jennifer E CaselleMarine Science Institute, University of California, Santa Barbara, CA 93106.
Sandrine Derrien-CourtelMuséum National d'Histoire Naturelle, Station Marine de Concarneau, 29182 Concarneau Cedex, France.
Graham J EdgarInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, 7001 TAS, Australia.
Matt EdwardsDepartment of Biology, San Diego State University, San Diego, CA 92182.
James A EstesDepartment of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064.
Claire GoodwinCentre for Environmental Data and Recording, National Museums Northern Ireland, Holywood, Co. Down BT18 0EU, United Kingdom.
Michael C KennerDepartment of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064.
David J KushnerChannel Islands National Park, Ventura, CA 93009.
Frithjof E MoyInstitute of Marine Research, 4817 His, Norway.ORCID 0000-0002-0790-4593
Julia NunnCentre for Environmental Data and Recording, National Museums Northern Ireland, Holywood, Co. Down BT18 0EU, United Kingdom.
Robert S SteneckSchool of Marine Sciences, University of Maine, Walpole, ME 04573.
Julio VásquezDepartamento de Biología Marina, Universidad Católica del Norte, Coquimbo 1781421, Chile.
Jane WatsonBiology Department, Vancouver Island University, Nanaimo, BC, Canada V9R 5S5.
Jon D WitmanEcology and Evolutionary Biology, Brown University, Providence, RI 02912.
Jarrett E K ByrnesDepartment of Biology, University of Massachusetts, Boston, MA 02125.ORCID 0000-0002-9791-9472

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Kelp forests (Order Laminariales) form key biogenic habitats in coastal regions of temperate and Arctic seas worldwide, providing ecosystem services valued in the range of billions of dollars annually. Although local evidence suggests that kelp forests are increasingly threatened by a variety of stressors, no comprehensive global analysis of change in kelp abundances currently exists. Here, we build and analyze a global database of kelp time series spanning the past half-century to assess regional and global trends in kelp abundances. We detected a high degree of geographic variation in trends, with regional variability in the direction and magnitude of change far exceeding a small global average decline (instantaneous rate of change = -0.018 y

Indexed as

EcosystemForestsArctic RegionsClimate ChangeKelpOceans and Seasclimate changecoastal ecosystemsglobal changekelp forestLaminariales

Identifiers

PMID27849580
PMCPMC5137772

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.